Shadow stroking

I work mostly night shift hours and doing so allows me the privilege of an empty office until around 5 am. When I get to work I turn the lights on (between 6pm and 10pm the office lights are off and the doors locked - only accessible via security card) and proceed to activate my work pc. While that is booting up I listen to some music while I make a cup of coffee.
Last night I was at home checking some pics on a particular site (this one) and was getting quite turned on. I began to masturbate but soon ran out of time and had to leave for work.
Cut to the office....
My cock still tingled with the "entertainment" I indulged in earlier and really needed to release the tension...
Never before have I ever attempted to wank off at work...but this night I could not help myself.
The front of the office has windows that front the main entrance way. At night you can clearly see out but with the lights off no one can see in. So I decided to completely strip off and stand in this front office area and stroke my cock. At first it was a little difficult to get hard due to the atmosphere of the office. You might say it is not conducive to any kind of eroticism but soon the excitement of being naked and alone in this office soon took hold, so to speak, and my cock grew extremely hard. I furiously wanked my cock (for how long, I think maybe 15 or so minutes) and soon was building up to a reasonable orgasm.
When I was getting close to cumming I realised I didn't have anywhere for my cum to go...
The best idea was to just simply cum on the table that sat adjacent the windows. When I came, I must say it seemed like more than a few cups ful. There it was a streak of my white magic, strewn across the laminated surface. I had to use a few tissues to clean it up.
I don't know if I would do that again but it felt good and certainly did relieve the horny back-log.